Vibrationproof lighting unit



Jan. 14, 1930. L. c. DO ANE VIBRATIONPROOF LIGHTING UNIT Filed Dec 11.1924 INVENTOR C j 5: B25 4' ATTORNEY Patented Jan. 14, 1930 omrrosmresPATENT OFFICE LEROY C. DGANE, 0F 'MEBIDEN, CONNECTICUT, ASSIGNOR TO THEMILLER COMPANY, OF MERIDTEN, CONNECTICUT, A CORPORATION OF CONNECTICUTVIBRATIONPBOOF LIGHTING UNTT A catio fil De m er 924- se a 9.- 55. I

The present invention consists of a lighting unit designed for car, bus,automobile lighting or similar installations and its ob ject "is toprovide a unit which will pri- 5 inarily resist the jar and strain oftrafiic service and yet be of an agreeable appearance and simple inmaintenance.

Fig. 1 is a vertical cross section of the unit seated in the roof of thecar and showing the glassware in elevation;

Fig. 2 is a vertical cross section of the ho de on Fig. 3 is a bottomplan view of the holder, and

Fig. 51 is a top plan view of the shade or globe employed in the unit.

The unit Comprises a holder or canopy and a shade with variousmechanisms to retain the shade in the holder 1n Figs. 1 and 3 are showna cylindrical canopy or holder 16 having ring-like walls 7 and a top 3provided with a tubular opening 2 for the insertion of the lamp socketor receptacle '15 provided with the terminals 1t eomrnonl-y used in thistype of service. A pair of resilient springs 1 is fastened in the insideof the top of the holder by means of screws -9 following the circularcontour similar to that of the wall for purposes hereinafter set forth.Toward the bottom of the ring, on its interior, are formed a series oftapering lugs 11 consisting of two teeth 12 and 13 with a sloping,recessed portion '11 therebetween. The shade 7 has a series of lugs 6 onits neck 5, these lugs being slightly inclined in the manner shown tofit the sloping recesses 11. The holder is adapted to be fastened in theceiling or wall of the car, by screws 10 passing through the holes inthe flange, and when the ceiling or wall of the car is inclined as isoften the case, the flange 8 is inclined relative to the axis of theholder as shown in Fig. 1, lying in the plane passing through the upperand lower edges of the ring; this causes the mouth of the ring and theshade to lie parallel to the floor of the car or bus. In other cases theflanges may be in a plane at right angles to the vertical axis of holderand reflector.

The method by which the holder and re- V tened flush to the ceilingproper by means of screws 10 the wires having been connected to the lampsocket. The reflector lugs6 are then inserted into the spaces 18 betweenthe lugs 11 on the ring of the holder, the upper rim of .the neck of thereflector being pressed against the springs {1 until the lower surfacesof the reflector lugs 6 are brought above the level of the lugs 12 ofthe holder when the shade may be turned angularly, the sloping shadelugs actingto further compress the springs. When the reflectorneck isrevolved sufliciently in the holder to permit the reflector lugs to passby the portions '12 of the lugs and enter the recessed area 11 of theholder lugs beyond the first tooth of the holder lugs, the pressure isremoved from the shade and the springs press the lugs of the shadedownward into the space between the two teeth on the holder lugs and theshade is thuslocked in position. The oblique faces on the shade lugs 6and the oblique bottom wall of the recesses 11 on the holder act tocause the shade lugs to be securely anchored in place. Thesprings forcethe parts into place and the portions 12 of the lugs act as abutments toprevent the springs from forcing theshade lugs too far to cause anunthreading action. The higher part 13of the lugs limits the turningmovement of the shade and prevents turning the shade so far that theshade lugs may be forced out through the adjacent spaces. 7

It Wlll be readily seen that any strain or jar .due to the vibration ofthe car will not adversely affect the holder or shade because of thevarious elements in the shade holder contributing to a firm butresilient seat. The adjustment of the flanges on the holder in the formshown in Fig. 1, permits the mouth of the shade always to be parallelwith the floor of the carland therefore permits the light rays to bereflected .in useful zones in the bus. No jolt or jar can possiblyunseat the lugs 6 of the reflector from the depression in the lug 11 onthe inside of the top of the holder, while rec in order to remove theshade, it is only necessary to push upward above the level of the lugsand turn it until the lugs of the shade fall into the spaces between thelugs of the holder, when the shade can be detached from the holder.

I claim:

1. In a unit for car lighting, a cylindrical holder, a shade revolvingin the holder, the holder being provided on the under side of its topwith resilient spring members and with spaced lugs on the bottom of thecylinder wall, each having a tooth at each end of a tapering depression,the shade having spaced oblique lugs on its upper portion adapted toenter the spaces between the holder lugs and ride thereon, the shadebeing held in position by pressure of the springs on the shade lugs whenpositioned on the holder lugs between the teeth.

2. A shade holder for vibration-proof lighting units, said holder havinga downwardly facing annular shoulder, a pair of upwardly facing slopingshoulders, a dwell beyond the upper end of each sloping shoulder toreceive a shade lug, and a substantially fiat leaf spring adjacent thefirst shoulder and adapted to press the lugs into the dwells and preventrattling of the shade.

' 3. In a unit for car lighting, a shade holder having a downwardlyopening mouth, the inner side walls of which are provided with lugshaving ascending sloping shoulders to guide the lugs of a shade,recesses in said lugs to receive the shade lugs, an annular shoulderabove the mouth of the holder and of smaller diameter, a lamp receptaclemounted in the holder, and a substantially flat leaf spring carried bythe shoulder outside the lamp receptacle for pressing the shade lugsinto the recesses and preventing rattling of the shade in the holder,said holder having a peripheral flange for attach ing the holder to acar ceiling, with the axis of the holder vertical.

4. In a vibration-proof lighting unit, a shade holder, a shade whoseupper end is provided with spaced lugs angularly movable inside theholder when inserted therein, the holder having interiorly disposedspaced lugs between which the lugs on the shade are adapted to pass wheninserting the end of the shade into the holder, the shade holder lugshaving recesses to receive the shade lugs when the shade is turnedangularly, a lamp socket passing through the rear portion of the holder,and spring means disposed about the socket and supported from the shadeholder for pressing against the rear end of the shade to hold the lugsin the recesses, the cooperating lugs having oblique surfaces tofacilitate securely seating the shade lugs in the recesses and hold themagainst stops carried by the shade holder.

5. In a vibration-proof lighting unit, in

combination, a shade holder, a shade, the shade holder having a chamberfor receiving the end of the shade, the walls of the chamber beingprovided with spaced shade supporting lugs, the shade having spaced lugsprovided with oblique lower faces and disposed so as to pass between theshade supporting lugs, the shade supporting lugs having recesses intowhich the shade lugs may be turned, the recesses having oblique faces tocooperate with the oblique faces on the shade lugs and stops to limitthe turning movement of the shade, and spring means carried by the shadeholder for forcing the shade lugs into the recesses and against thestops. 1 i 6. In a vibration-proof lighting unit, in combination, ashade holder, a shade,-the shade holder having a chamber for receivingthe end of a shade, the walls of the chamber being provided with spacedshade supporting lugs, the shade having spaced lugs so disposed as topass betweenthe shade supporting lugs, the shade supporting lugs havingrecesses into'which' the shade lugs may be turned, the recesses havingstops to limit the turning movement of the shade, a lamp socket carriedby the shadeholder in a position to carry a lamp within the shade, andspring means carried by the shade holder outside the'lampsocketforforcing the shade lugs into the recesses.

7. In a unit for car lighting, a shade holder having a downwardlyopening mouth, the inner side walls of which are provided with ascendingslopingshoulders to guide the lugs of a shade, dwells or recesses beyondthe shoulders to receive the shade lugs, an annular shoulder above themouth of the holder and'of smaller diameter, a lamp receptacle mountedin the holder, and a substantially flat leaf spring carried by theshoulder outside the lamp receptacle for pressing the lugs into therecesses, and prevent rattling of the shade in the holder.

Signed at Meriden in the county of New Haven and State of Connecticutthis 28th day of November, 1924.

LEROY C. DOANE.

